[readme] Improve README about Macs with M1 chips
Mention that you must have Rosetta 2 installed and provide instructions on how to do it.
diff --git a/README.md b/README.md
index b43a699..160d2ed 100644
--- a/README.md
+++ b/README.md
@@ -905,6 +905,7 @@
- you already have versions `12.20.1` and `14.15.4` installed using `nvm`
- the current version in use is `14.15.4`
- you are using the `zsh` shell
+- you have Rosetta 2 installed (macOS prompts you to install Rosetta 2 the first time you open a Intel-only non-command-line application, or you may install Rosetta 2 from the command line with `softwareupdate --install-rosetta`)
```sh
# Check what version you're running:
